Peak Nordic hamstring torque ranged 96.8–163.5 Nm, and peak MVC eccentric torque ranged 50.7–109.4 Nm at 30°/s and 59.2–121.2 Nm at 60°/s. Correlations among the dependent variables were assessed using Pearson’s correlation coefficients. MVC torque of the knee flexors was measured isometrically at 30°, 45°, 60°, and 90° knee flexion joint angles, and concentrically and eccentrically at 30°/s and 60°/s in 10°–90° knee flexion for the dominant leg in a prone position. The force was multiplied by lower leg length and converted into torque. In Nordic hamstring, each participant was instructed to lean forward as far as possible in 3 s (approximately 30°/s), and force at the ankle joint of the dominant leg was measured during the movement. Sixteen healthy young men who had not experienced hamstring strain injuries participated in the study. We investigated the relationship between Nordic hamstring strength and maximal voluntary contraction (MVC) torque of the knee flexors measured by an isokinetic dynamometer. However, what exactly Nordic hamstring strength indicates is not clear. Nordic hamstring exercise is performed to prevent knee flexor muscle strain injuries and used to assess their injury risks.
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